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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/doc/crypto/RSA_check_key.pod | |
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Diffstat (limited to 'openssl/doc/crypto/RSA_check_key.pod')
-rw-r--r-- | openssl/doc/crypto/RSA_check_key.pod | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/openssl/doc/crypto/RSA_check_key.pod b/openssl/doc/crypto/RSA_check_key.pod new file mode 100644 index 000000000..a5198f3db --- /dev/null +++ b/openssl/doc/crypto/RSA_check_key.pod @@ -0,0 +1,67 @@ +=pod + +=head1 NAME + +RSA_check_key - validate private RSA keys + +=head1 SYNOPSIS + + #include <openssl/rsa.h> + + int RSA_check_key(RSA *rsa); + +=head1 DESCRIPTION + +This function validates RSA keys. It checks that B<p> and B<q> are +in fact prime, and that B<n = p*q>. + +It also checks that B<d*e = 1 mod (p-1*q-1)>, +and that B<dmp1>, B<dmq1> and B<iqmp> are set correctly or are B<NULL>. + +As such, this function can not be used with any arbitrary RSA key object, +even if it is otherwise fit for regular RSA operation. See B<NOTES> for more +information. + +=head1 RETURN VALUE + +RSA_check_key() returns 1 if B<rsa> is a valid RSA key, and 0 otherwise. +-1 is returned if an error occurs while checking the key. + +If the key is invalid or an error occurred, the reason code can be +obtained using L<ERR_get_error(3)|ERR_get_error(3)>. + +=head1 NOTES + +This function does not work on RSA public keys that have only the modulus +and public exponent elements populated. It performs integrity checks on all +the RSA key material, so the RSA key structure must contain all the private +key data too. + +Unlike most other RSA functions, this function does B<not> work +transparently with any underlying ENGINE implementation because it uses the +key data in the RSA structure directly. An ENGINE implementation can +override the way key data is stored and handled, and can even provide +support for HSM keys - in which case the RSA structure may contain B<no> +key data at all! If the ENGINE in question is only being used for +acceleration or analysis purposes, then in all likelihood the RSA key data +is complete and untouched, but this can't be assumed in the general case. + +=head1 BUGS + +A method of verifying the RSA key using opaque RSA API functions might need +to be considered. Right now RSA_check_key() simply uses the RSA structure +elements directly, bypassing the RSA_METHOD table altogether (and +completely violating encapsulation and object-orientation in the process). +The best fix will probably be to introduce a "check_key()" handler to the +RSA_METHOD function table so that alternative implementations can also +provide their own verifiers. + +=head1 SEE ALSO + +L<rsa(3)|rsa(3)>, L<ERR_get_error(3)|ERR_get_error(3)> + +=head1 HISTORY + +RSA_check_key() appeared in OpenSSL 0.9.4. + +=cut |